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Synthesis, crystal structure, and thermal stability of new borates Na3REB2O6 (RE = Pr, Sm, Eu)

Published online by Cambridge University Press:  28 April 2016

Zhixun Wang ,
Hangkong Li ,
Gemei Cai  and
Zhanpeng Jin
Zhixun Wang
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China Education Ministry Key Laboratory of Non-ferrous Materials Science and Engineering, Central South University, Changsha 410083, China
Hangkong Li
Affiliation:
Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong Special Administrative Region, China
Gemei Cai*
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China Education Ministry Key Laboratory of Non-ferrous Materials Science and Engineering, Central South University, Changsha 410083, China
Zhanpeng Jin
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China Education Ministry Key Laboratory of Non-ferrous Materials Science and Engineering, Central South University, Changsha 410083, China
*
a) Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

Subsolidus phase equilibrium of Na2O–Sm2O3–B2O3 system has been investigated mainly by solid-state reaction and powder X-ray diffraction method. There are nine definite three-phase regions and three ternary compounds determined under present experimental conditions. A novel compound Na3SmB2O6 was found and confirmed in this system, along with its two homogeneous compounds Na3REB2O6 (RE = Pr, Eu) synthesized for the first time. The indexing results showed that all three compounds crystallize in the monoclinic space group P21/c (No.14) with the same structure type as both Na3NdB2O6 and Na3GdB2O6. The lattice parameters (a, b, and c) of new borates Na3REB2O6 (RE = Pr, Sm, Eu) decrease linearly with a decreasing radius of RE ion, which obeys the Lanthanide-contraction rule. The existence of a trigonal BO3 group in the Na3REB2O6 (RE = Pr, Sm) compounds was confirmed by analysis of their infrared absorption spectra. Thermal stabilities of the three new borates have been investigated.

Keywords

powder X-ray diffractioncrystal structureinfrared absorption spectrathermal stabilityrare earth borates
Type
Technical Articles
Information
Powder Diffraction , Volume 31 , Issue 2 , June 2016 , pp. 110 - 117
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Copyright
Copyright © International Centre for Diffraction Data 2016 

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